QPSK modulator or demodulator using subharmonic pump carrier sig

Details QPSK modulator or demodulator using subharmonic pump carrier sig QPSK modulator or demodulator using subharmonic pump carrier sig

1985-05-28

1986-09-16

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

329 50, 329116, 329122, 332 22, 332 23R, 375 52, 375 67, 375 83, 375 94, H04L 2720, H04L 2722

Patent

active

046125183

ABSTRACT:
The present invention relates to a QPSK modulator or demodulator for modulating two different input bit streams with a subharmonic pump carrier signal to produce an appropriately encoded QPSK output signal. The subharmonic pump carrier signal used is a submultiple of a predetermined microwave or millimeter-wave carrier frequency. The QPSK modulator or demodulator is capable of being fabricated on a planar substrate using appropriate stripline filters and a mixer diode in each of an in-phase and quadrature signal path. A fin line arrangement, also capable of fabrication on the substrate, can be used to introduce an appropriately phased subharmonic pump carrier signal into each of the in-phase and quadrature signal paths before each mixer diode. Each mixer diode mixes the associated data bit stream and one of the two appropriately phased pump carrier signals to produce separate output signals which modulate along separate orthogonal axes, which output signals are combined to produce the QPSK modulator output signal.

REFERENCES:
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patent: 4480336 (1984-10-01), Wong et al.
patent: 4485488 (1984-11-01), Houdart
patent: 4528526 (1985-07-01), McBiles
Schneider, IEEE Trans. MTT, vol. MTT-23, No. 3, Mar., 1975, pp. 271-275.
Giannini et al., IBM Tech. Disclosure Bulletin, vol. 21, No. 1, Jun. 1978, pp. 123-124.
Tatsuguchi et al., ICC '79, Jun. 10-14, 1979, Boston, Mass., vol. 2, pp. 26.2.1-26.2.5.
Shoho et al., Microwave Jrnl., vol. 25, No. 9, Sep. 1982, pp. 131-132, 134, 136, 138.
Dixon et al., IRMM 1983, Dec. 12-17, 1983, Miami Beach, Fla., paper T6.9.

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